Circuit Protections; Fuse; Thermal Switch; Interlock Switch - Sanyo PLV-80 Service Manual

Circuit Protections

This projector is equipped with the following circuit protections to operate in safety. If the abnormality occurs inside
the projector, it will automatically turn off by operating one of the following protection circuits.

Fuse

The fuse is located inside of the projector. When either the
LAMP indicator or the READY indicator is not illuminated, fuse
may be opened. Check the fuse as following steps.
It should be used the specified fuse as follows;
Fuse Part No.: 423 025 1201
TYPE T8AH 250V FUSE
LITTEL FUSE INC. TYPE 215008
How to replace the fuse
1.
Remove the cabinet top following to "Mechanical
Disassemblies".
2.
Remove the fuse from fuse holder.
To install the fuse, take reversed step in the above.

Thermal switch

There is the thermal switch (SW905) inside of the projector to
prevent the internal temperature from rising abnormally. When
the internal temperature reaches near 90˚C, turn off the AC main
power supply automatically.
The thermal switch is not reset to normal automatically even if
the internal temperature becomes normal. Reset the thermal
switch following procedure.
Check the resistance between terminals of thermal switch by
using the tester. If it has high impedance, thermal switch may be
in operative.
How to reset the thermal switch
1.
Loosen 2 screws and open the lamp cover.
2.
Press the reset button on the thermal switch with a sharp-
pointed tool.
CAUTION:
Before press the reset button, disconnect the AC cord from the
projector.

Interlock switch

The interlock switch (SW902) cuts off the AC mains power sup-
ply when the lamp cover is removed. After opening the lamp
cover for replacing the lamp ass'y, place the lamp cover correctly
otherwise the projector can not turn on.
Fuse
Interlock switch
Thermal switch
-5-
Line Filter Board
Lamp cover